Relay.



s/GABOT, l

v RELAY,v APPLIUATION'FILED NOV. 20, 1906,

APatented Mar. 30, 1909.

WITHEEEE;

UNITED STA133s- PATENT Ormea.

sEwALL oABoT, OF naoorrLgrN'n', iiAssAonUsnr'rs AssreNoR To sroNnfTELE'GsArn-AND TELEPHONE COMPANY, or BOsToN,-ivrAssAon :-Usa'rrs, A CORPORATION or MAINE.

Banni?.

- Specification of Letters Patent.

Patented March so', 1909.

Application led November 20, 190e. Serial No. 344,238.

fated by feeble electrical currents, AThe object of my invention is to provide a ,relay which may be operated by the minute electrical currents developed in the local receiving circuit of `a wireless telegraph receiving system'which includes a-'sensitive oscillation detector, and which in turn may controla signal indicating device which could not directly be operated by said oscillation detector, such, for example, as a telegraph sounder.v

ln the vdrawings which accompany and form a part of the present specification, the' figurerepresents in diagramA one sim le embodiment of my invention associate in one of many possible ways with the local receiving circuit of a wireless telegraph receiving Y system.

A' represents an armature, `herein shown as a dia hragm, and T. is an electromagnet arrange to operate upon said armature or dia hragm.

is a contact member, preferably of easily fusible metal and which may be provided witll'a peint, making electrical contact with said armature and shown in the present case as pivoted to a support and resting with its ointed terminal upon the dia hragm A', being held in contact therewi't by gravity. The batteryl B" and the electromagnet G, which may be a signal indicating device, are

included in series with the contact membervwhich preferably is one of A'relativelylarge capacity, for example, one microfarad, is

connected directly across the' terminals ofthe contact member F and the diaphragm A.

When the member F 'is raised out of contact with the dia hragm A', the condenser' C will be char e by.`r the battery B", and when the .mem er F is again brou ht into contact the diaphragm A', t e con- -ment of the retractile spring finvention, shown the same associated therevwith through the interpositionl of a our ent amplifying device.

Yphragm A, the latter closing the circuit of denser C will discharge across the contact, formedbetweeali and A. This discharge, being unimpeded by the resistance of a battery or resistance coil, will slightly fuse the contact member `to the diaphragm and greatly reduce the, resistance of saidfcontact,

thus permittingthe current from. the battery B" to energize the ma net Gr.v The 'energization vof the magnet will cause the armature H to bebrought' against'its front stop, thereby opening the circuit of the sounder K. The device is now' in condition for use. In 'suche condition, feeble electrical currents developed in the windings of the magnet T willoperate upon the armature or diaphragm A', thereby breaking the electrical connection between F andA or atl least greatly increasing the resistance of the contact therebetween. This results in-o ening the circuit of theV magnet G or at east in greatly reducing the iiow of current in said circuit, sothat by the 1proper adjustthe armatureV H will be retracted and close the circuit of the sounder K. If the current flowing through the windings of the magnet T' be a vibratory current, it is possible so to adjust the apparatus that the sounder Kv will remain energized during the flow of said current. Upon the cessation of current iiow through the windings of the magnet T', -the discharge of the condenser C'. across the contact between the members F and A' will again slightly fuse said members together, thereby closing the circuit of the magnet or relay G sufficiently to permit the latter to attract its armature and open the circuit ofthe sounder K. v

VVllile a number of ways of associating the magnet T and its associated apparatus and circuitswith .the local circuit of a'wireless telegraph receiving system will readily occur to those skilled in the art, l have, for the purpose of more completely disclosing my The current am lifying device may consist as shown of a te e hone relay consisting of a. magnet T an dia the battery B and primary of the'transformerv M' through the carbon contacts D. The windings of the magnet T' are herein shown as connected in series with the secondary of said transformer M', which maybe 110 T is connected -a step-up transformer. The telephone relay1 in series with the oscillation. detector W, the secondary winding of theoscillation transformer M and a portion of the potentiometer resistance R. The oscillation detector'may be of any suitable type and'is herein shown as consisting of an anode Z pl" ced'in close juxtaposition to a cathode .e oi much greater area than the anode and both immersed in a suitable electrolyte.

When electrical oscillations are developed byelectromagnetic signal waves in the ele-v vated receiving conductor system, consistingv of the elevated conductor V and the primary` f of the transformer M, earthed at E, high Jfreuency electrical oscillations areldeveloped t erein and their energy istranslated t'o the resonant receiving circuit which includes the condenser@ andthe secondary of said trans'- formerM.` By the accumulative' action rof electrical resonance the diiierence of potential developed across the terminalsl of the `condenser (J varies the resistance of the oscillation detector land enables *the current from the battery B to iiow from the positive terminal thereof through the secondary of the transformer M to the anode Z, thence to the cathode z, through the winding of the telephone T and a portion of the resistance.

It, and thence back to the battery B. The energization of the telephone T and the resulting vibration of it's diaphragm A will produce a pulsating current in the circuit of the primary of the transformer'M which will be converted into `Stn-alternating current in the secondary thereof, thereby causing the magnet T to operate upon its armature Af and, throw the latter into rapid vibration at a rate determined by the nature of the current flowing through the windings of said magnet.

' The contact member F is o'll such nature that its inertia prevents it i'rom following the vibrations of the armature or diaphragm A. The minute welding of the contact between I*V and A is thus mechanically interrupted and theresistance of the circuit which infcludes the windings of the magnet G,- therebyv is so greatly increased that an inappreciable amount of current will iow through said windings and practically denergize said magnet, permitting the armature II'to fall 4 back and close`the circuit of thesounder Ii.

- I do not wishr to be limited to the precise arrangements of apparatus and circuits herein described and diagrammatically illustrated m the drawing for the purpose of more fully disclosing my invention, inaselastic? much as my invention may be subjected to a from the principle thereof.

' I claim,

1.` In combination, an armaturaan electromagnet arranged to operate u on said armature, a contactv member of eas" y-fusible metal malring electrical-contact with said armature, a circuit including said armature and said contact member, a source of elec- 'trical energy in said circuit and a condenser connected across the terminals of said armature and contact member. y

2. In combination, a diaphragm, an elecphragm, acontact member of easily-fusible 'metal resting upon said diaphragm, a ,circuit including' said ,diaphragmv and said contact member, a source of electrical energy in said circuit and a condenser-connected across the terminals of said diaphragm and contact member., .i f 3'. In combination, a diaphragm, an electromagnet arranged to vibratev said diaphra m, a "contact member of easily-'fusible meta resting uponsaid diaphragm, a circuit including said diaphragm and contact member, a source of electrical energy and an Aelectromagnetv in said circuit, and a condenser connected across the terminals of said diaphragm and contact. member. I

4. In combin tion,.a diaphragm, an electromagnet arranged tovibrate said diaphra m, a contact member oi' easily-fusible meta restingfupon said diaphragm, a circuit including said diaphragm and said contact member, a source .of electrical energy and a relay in said circuit, a condenser connected across the terminals of said diaphragm' and' contact member, and a circuit including a source ofelectrical energy and a signalindicating device controlled by said relay.`

5. In combination, adiaphragm, an electromagnet arranged to vibrate said diaphragm, axcontact member'of easily-fusible SEWALL 'CABOT Witnesses: l

CHARLEs C. KURTZ,

GEO. K. Woonwon'rn.

metal resting' upon said diaphragm, a circuit -wide range of variation without departing tromagnet arranged to vibrate said dia- 

